Seaside
Coastal
noun, の adjective
If you look to the sea, you are seaside or coastal.
りんかい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
日本の学生の多くは、夏に臨海学校に行く事を経験します。
Many Japanese students experience going to seaside schools during the summer.